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package fswatch
import "os"
type watchItem struct {
Path string
StatInfo os.FileInfo
LastEvent int
}
func watchPath(path string) (wi *watchItem) {
wi = new(watchItem)
wi.Path = path
wi.LastEvent = NONE
fi, err := os.Stat(path)
if err == nil {
wi.StatInfo = fi
} else if os.IsNotExist(err) {
wi.LastEvent = NOEXIST
} else if os.IsPermission(err) {
wi.LastEvent = NOPERM
} else {
wi.LastEvent = INVALID
}
return
}
func (wi *watchItem) Update() bool {
fi, err := os.Stat(wi.Path)
if err != nil {
if os.IsNotExist(err) {
if wi.LastEvent == NOEXIST {
return false
} else if wi.LastEvent == DELETED {
wi.LastEvent = NOEXIST
return false
} else {
wi.LastEvent = DELETED
return true
}
} else if os.IsPermission(err) {
if wi.LastEvent == NOPERM {
return false
} else {
wi.LastEvent = NOPERM
return true
}
} else {
wi.LastEvent = INVALID
return false
}
}
if wi.LastEvent == NOEXIST {
wi.LastEvent = CREATED
wi.StatInfo = fi
return true
} else if fi.ModTime().After(wi.StatInfo.ModTime()) {
wi.StatInfo = fi
switch wi.LastEvent {
case NONE, CREATED, NOPERM, INVALID:
wi.LastEvent = MODIFIED
case DELETED, NOEXIST:
wi.LastEvent = CREATED
}
return true
} else if fi.Mode() != wi.StatInfo.Mode() {
wi.LastEvent = PERM
wi.StatInfo = fi
return true
}
return false
}
// Type Notification represents a file state change. The Path field indicates
// the file that was changed, while last event corresponds to one of the
// event type constants.
type Notification struct {
Path string
Event int
}
// Notification returns a notification from a watchItem.
func (wi *watchItem) Notification() *Notification {
return &Notification{wi.Path, wi.LastEvent}
}
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